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Arabidopsis GH3.10 conjugates jasmonates.

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Jasmonoyl-isoleucine (JA-Ile) is crucial for plant development. This study reveals JAR1 and GH3.10 are the sole JA-Ile producers in Arabidopsis, identifying other jasmonate conjugates that may regulate fertility.

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Jasmonates are key regulators of plant development and defense responses.
  • Jasmonoyl-isoleucine (JA-Ile) is the canonical bioactive jasmonate in angiosperms, synthesized by JAR1 and GH3.10 in Arabidopsis thaliana.
  • The fertility of gh3.10 jar1 knockout lines suggests other jasmonates or GH3 enzymes may play a role.

Purpose of the Study:

  • To investigate the contribution of other jasmonates and GH3 enzymes to plant fertility regulation.
  • To identify the complete set of enzymes responsible for JA-Ile biosynthesis in Arabidopsis.
  • To explore the potential bioactivity of novel JA conjugates in the absence of JA-Ile.

Main Methods:

  • Liquid chromatography-mass spectrometry (LC-MS) for jasmonate quantification.
  • Non-targeted ex vivo metabolomics of Arabidopsis flower and leaf extracts.
  • In vitro enzyme assays to determine the substrate specificity of recombinant GH3 enzymes.
  • Jasmonate application experiments to assess bioactivity.

Main Results:

  • JAR1 and GH3.10 were confirmed as the exclusive enzymes for JA-Ile biosynthesis in Arabidopsis.
  • 12-hydroxy-JA was identified as the preferred substrate for GH3.10.
  • Novel JA conjugates (JA-Gln, JA-Asn, JA-Glu) were identified in flowers and leaves, particularly in JA-Ile deficient lines.
  • The aos gh3.10 jar1 mutant was generated as a tool to study JA-Gln bioactivity.

Conclusions:

  • Arabidopsis thaliana relies solely on JAR1 and GH3.10 for JA-Ile production.
  • Several JA conjugates are present and potentially bioactive in the absence of JA-Ile.
  • The precise role of these JA conjugates in regulating plant fertility requires further investigation.